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A138579
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Numbers n such that 2^(2*n-9)-9 is prime.
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0
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5, 7, 9, 10, 13, 15, 21, 67, 75, 126, 130, 147, 165, 273, 286, 354, 369
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..17.
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EXAMPLE
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2^(2*7-9)-9=23, 2^(2*9-9)-9=503, 2^(2*10-9)-9=2039, 2^(2*13-9)-9=131063
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MATHEMATICA
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q=9; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
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PROG
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(PARI) is(n)=isprime(2^(2*n-9)-9) \\ Charles R Greathouse IV, Jun 13 2017
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CROSSREFS
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Sequence in context: A039501 A114255 A350496 * A189703 A158251 A212191
Adjacent sequences: A138576 A138577 A138578 * A138580 A138581 A138582
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KEYWORD
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nonn,easy
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AUTHOR
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Vladimir Joseph Stephan Orlovsky, May 13 2008
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STATUS
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approved
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